Locomotive stop valve



March 3, 1931. I F. BENGER 1,794,830

LOCOMOTIVE STOP VALVE F'iledbec. 8, 192a 2Q /4 /4 2 I /5 I I 3 T1 5'. E.

fled: kI C/t Zen er IN V EN TOR.

A TTORNE Y dome 4 to the superheater header 5.

Patented Mar. 3, 1931 te n nannnnror Banana, on ivioiv'rnnnn, QUEBEC, CANADA, Assrenon or own-HALF. roff DAVID ANGUS, F HAIMSTEAD, QUEBEC, CANADA LOGOMOTIVE error VALVE Application filed. December s, 1928. Serial No. 324,766.

This inventionrelates to locomotives and especially to stop valves located in the steam dome and 'LlSGClfiOI' the purpose of shutting oti the steam from the steam chests under certain condition. The invention has particular utility in cases Where the main throttle which controls the flow ofsteam from'the boiler to the steam chests is located in the path or paths between the superheater and the steam chests. In such cases it becomes desirable under some conditions to have an additional means on the inlet side of the superheater for shutting oil the steam at this point. The invention has for its purpose the provision of improved stop valves for this purpose. I

The invention is illustrated in the drawing herewith in which Fig.1 shows a fragmentary, central, longitudinahvertical sec tion of a locomotive with my invention applied; Fig. 2 is an enlarged view of the pertions of Fig. 1 more intimately connected with the invention; Fig; 3 is a section on'line 3-3 of Fig. 2, and Fig. 4 is a section on line 4+4 of Fig. 2. v

The boiler shell appears in Fig. 1 at 1, the smoke-box sheet showing at 2; 3 is the flue sheet separating the boiler space from the smoke-box. 4 is the steam dome. The superheater header is shown at 5. It is believed unnecessary to illustrate the details of the header or the superheater units themselves as the header and the units may be of any preferred construction and form'no part of the invention. 6 is the dry pipe leading fronithp 13 appears one of the steam pipes which carry the steam to the two valve chests. In the form illustrated, the flow of the steam from the superheater header to'the valve chests is controlled by a series ofvalves, one of which shows at 8. Their movement is produced by means of the throttle rod 9 moving lever 10-.

The part embodying my invention is the valve at the entrance 11 of the steam pipe 6. The valve proper 12, it will be noted, is discshaped and in its seated position engages the upper edge of the opening 11 ofthe steam pipe 6. On the disc 12 are formed two parallel lugs or ears 1313, each provided with two vertical slots 14-14. Extending through these vertical slots are the pins 1515. These pins also extend throughholes in the links 16.16of which there are four extending inan upward direction. The up per ends of these links have extending through them pins 1717. These pins 17-17 also extend through holes in the two blocks 1818 lying between the links. The" blocks 1818 have internal right and left screw-threads engaging corresponding left and right screw threads 1919 on the spindle 20. At the center of the spindle between flanges21-21 is a portion 32 ,on the spindle 2O which is not threaded and against which, bears the curved support 33. .This support is held in place by the two screws-34f-34 inserted from the outside of thecover 23. The purpose OftlllS support 33 1s" to prevent springing of the spindle when the pilotvalve 28 andthe main valve 12 are raised. The spindle passes through a stufling box 22 screwed into the side of the dome cover 23,

the opposite end 24 engaging "a bearing 25 located 1n the inner wall of the dome cover.

Ontheunderside ofthecover there are stops r 26 to limit the upward movement of the i 26 valve.

recess in the cover 23.; The advantage ofthis is that it obviates the necessity of any cotter pins in connection; with the pins 17-17.

"Whenonce in place. these pins cannot come Thispilot valve has two upwardly extending lugsor ears 29, through which the pins 15 -15 also pass. I

The cover 23 issecuredin place on itsopening in the steam dome 4 by studs and nuts 30- .0. v.

In the center of the upper side of the cover 23 a threaded opening 31 is provided for con- Theupper ends of thelinks1616 lie between the. sides 3535 oi the elongated WVhen the valves are venient insertion of an eye-bolt or other means for lifting the cover. v

The spindle 20 is actuated by any preferred means. t is shown squared at the end so that a hand-wheel may be put in place. Preferably, however, such a hand-wheel is not permanently attached it would extend above the contour of the dome beyond the allowable clearances. Ordinarily a wrench would be sufficient for turning the spindle. The operation ofthis device may be briefly stated as follows: A turning movement of the spindle in one direction will cause the blocks to move from the position indicated in Fig. 2 to that indicated in Eig. 1, the turning movement in the opposite direction resulting in opposite travel of the blocks. When the blocks move first stated, that is, outward from the position indicated in Fig.2, the first portion of the motion will liftthe )llOt valve :28 as there is no intentional play between the pins 15-15'and the open ngs in the ears 29.

No motion of the disc valve will occur until the pins l515 have reac l the upper ends or" the slots 14-1 he lifting of the pilot valve 28 allows steam to flow into pipe 6 and the cavities connected to it thereby balancing the disc valve 12. Upon turtxer mo tion of the spindle in the same direction and further consequent outward travel of the blocks 18, 18, the pins -15 engage the upper ends of the slots l-i-ld and lift valve 12. The stops 2626 are preferably of such dimensions that the discvalve 12 comes into contact with them before the blocks l8''18 reach the possible limit of their outward travel.

To close the valve the spindle is rotated in the opposite direction, the two blocks 185 13; move inward, and the disc valve is thus lowered to its seat. The last portion or" the motion permits the pilot valve 28 to become seated.

It will be obvious from the illustration that 7 due to the toggle action a great force can, if necessary, be exerted in either first raising or finally closing the valve. This may be of'a dvantage, for example in opening the valve if the valve should for some reason'or other, such as a leak on the outlet side, be imperfectly balanced.

It will be noted that there is no vertical spindle in my arrangement which might under some conditions interfere with the necessary clearances. Neither .is there a spindle extending through the side of the dome which is an objectionable feature 'in some prior constructions. The valve according to my invention is extremely compact and requires no enlargement of the dome nor does it introduce any complication in connection with the standpipe. It is very simple in construction and readily accessible for maintenance and repair.

I claim:

r 1. In apparatus of the class described, the

two blocks on said threads respectively and slideably engaging the sides and bottom of said recess, links pivot-allyengaging the blocks the pins, whereby beglnnlng with valve and pilotvalveboth closed rotary motion of the screw'in one direction first raises the pilot valve and thereafter the valve, and rotary movement in the opposite direction closes'both valves.

2. In apparatus of the class described the combination of a steam dome with an openin at its top,a cover for said opening, a drypipe in the steam dome with its open end opposite the r dome opening, a disk valve adapted to close said dry-pipe opening, Silld' cover having an elongated recess on its lower side, a right-and-left hand screw mounted in said recess and ex ending through the side of the cover, two blocks engaging the right and left handthreads of said screw respectively and slidably engagingthe sides and bottom of said recess, and links pivotally engaging the blocks and the valve.

' FREDERICK BENGER. 

